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Full Blood Count (CBC) Test

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Original price £55.00
Original price £55.00 - Original price £55.00
Original price £55.00
Current price £49.00
£49.00 - £49.00
Current price £49.00

The first step in identifying potential health issues and monitoring and diagnosing disease. Abnormal FBC results can be indicators of anaemia, infections or blood disorders.

  • Biomarkers: 15
  • Turnaround: 1-2 days

Quick and simple blood test from a local lab you can speak to.

Step 1. Choose sample collection option

Currently selected option: CLINIC APPOINTMENT

  • No waiting time - add same or next day appointment during checkout.
  • Rapid results - no waiting for the kit, no finger pricking, no posting the sample back.
  • Blood collection from your arm by our professional nurses.
  • Single appointment covers all your tests on the day.
  • We have clinics in London, Hove, Croydon, Guildford, Royal Tunbridge Wells, Cambridge, Maidstone and Crawley.

Clinic too far? Get a home kit by selecting "HOME KIT" as sample option, it's the same test.

About the test

Take control of your health with a Full Blood Count Test (FBC including DIFF) - the first step in identifying potential health issues and monitoring and diagnosing disease. Abnormal FBC results can be indicators of serious conditions such as anaemia, infections or blood disorders. Our CQC-regulated laboratory ensures rapid, accurate results for 15 biomarkers and ratios, including white blood cells, red blood cells, platelets, haemoglobin and more.

You will also get free access to our online Health Dashboard, which allows you to track your results over time and provides actionable ways to improve your health.

Order your full blood count home test kit today and get the answers you need to make informed decisions about your well-being.

What is a Full Blood Count Test?

A full blood count test (FBC) is a set of medical laboratory tests that provide information about the cells in your blood. 15 biomarkers and ratios are worked out during the analysis, including:

  • White blood cell count
  • Red blood cells and platelets
  • The concentration of haemoglobin
  • The haematocrit (the volume percentage of red blood cells)
  • DIFF count

Also included are the red blood cell indices, which indicate the average size and haemoglobin content of red blood cells, as well as the white blood cell differential, which counts the different types of white cells is also included.

Conditions like anaemia and thrombocytopenia are defined by abnormal full blood count test results. The red blood cell indices can provide information about the cause of a person`s anaemia such as iron deficiency and vitamin B12 deficiency, and the results of the white blood cell differential can help to diagnose viral, bacterial and parasitic infections and blood disorders like leukaemia.

Before you book

The FBC is often the first step of many medical assessments and can be used to monitor or diagnose disease. As with any test, full blood count test results are compared to reference ranges and interpreted thereafter. The reference ranges generally vary with sex and age, so if you are booking this test, make sure that you provide us with an accurate date of birth and your reference sex.

We offer this test as both capillary and venous sample options. However, this test is extremely time sensitive and the sample deteriorates very quickly, so you must send it to us in-line with exact instructions for posting (Monday to Thursday, before 12:00, taken in the morning before posting, found with your kit). If the sample deteriorates substantially - we will only report the essential parameters and will not offer a retest. If the sample is completely unusable due to delay in the post - we will, of course, offer you a retest. We advise you to have this test as a venous option, at one of our clinics, for a much more predictable experience.

Not all results falling outside of the reference range require medical intervention, please consult your GP.

15 Biomarkers


    - White Blood Cell Count (WBC)
    - Red Blood Cell Count (RBC)
    - Haemoglobin (HGB)
    - Hematocrit (HCT)
    - Mean Corpuscular Volume (MCV)
    - Mean Corpuscular Haemoglobin (MCH)
    - Mean Corpuscular Haemoglobin Concentration (MCHC)
    - Red Cell Distribution Width (RDW)
    - Platelets (PLT)
    - Mean Platelet Volume (MPV)
    - Lymphocytes (LYM)
    - Monocytes (MON)
    - Neutrophils (NEU)
    - Eosinophils (EOS)
    - Basophils (BAS)


    Need more biomarkers? Check out our Essential All Systems Blood Test


    For most biomarkers our usual turnaround time is 24-48 hours, or less, from the time your sample is in our lab. We do not wait for all the results to complete before sending them to you, so you may start receiving results the same day for most cases, or as results become available.

    We are extremely proud of our very short turnaround times and a very efficient laboratory processes. Whilst we accommodate the shortest of time scales, with some results available within hours, for this particular test the usual turnaround time is:

    1-2 days

Doctor's notes

Hi, I am Dr. Adam Staten and here's my view on this test as a GP and Clinical Director at One Day Tests.

The Full Blood Count is one of the most commonly requested blood tests by doctors because it gives us so much information and is often very important for picking up serious underlying problems. From this test we can tell whether you are anaemic, whether your immune system is healthy, whether you are likely to have adequate levels of iron, B12 and folic acid, and whether your blood is likely to clot properly.

Knowing that your full blood count is normal is useful for almost all medical complaints, but you might particularly be interested in your full blood count if you are feeling tired all the time or worry that you are more susceptible to infections than other people.

Red flag symptoms for the Full Blood Count (CBC) Test

Even if the blood tests is normal, you should still see your doctor if you have any of the symptoms below.

  • Unexplained weight loss
  • Drenching night sweats
  • Persistent fevers
  • Abnormal bruising or bleeding

Your Results and Health Dashboard

The results of your Full Blood Count (CBC) Test will be emailed to you as a secured PDF file, ready for your GP and will also be uploaded to our Health Dashboard area of the website. It’s a unique and powerful tool, powered by our in-house clinical analysis research, to match your biomarkers across test panels and symptoms, as well as provide clinical commentary on all individual biomarkers you tested for.

The health dashboard will also provide "panel level" commentary - a birds eye view of the biomarkers that were tested. This feature allows you to view your test results and clinical commentary, and compare them to previous results, giving you a clear understanding of how your health is progressing.

By using the Health Dashboard, you can identify changes in your biomarkers and make necessary adjustments to your lifestyle. This added value is immense, as it empowers you to monitor your health and make informed decisions about your well-being.

It's free and is available with all of our tests.

Save on continuous monitoring with our subscription plan

The best way to look after your health is to do so regularly. This is easy to do with our continual monitoring plans which give you a discount on future blood tests. You choose the frequency and we'll do the rest.

When you purchase a subscription, we will deliver your home test kits or allow you to book appointments in line with your chosen frequency. You will be able to track your biomarkers over time in our powerful Health Dashboard, where results will be automatically updated for you. There is a minimum of 3 tests with any subscription, after which you can pause/restart/cancel at any time.

Special instructions

Hi, I am Stefania Brown, I am the Laboratory Manager at One Day Tests and here are the lab's special requests for the Full Blood Count (CBC) Test.

We advise to take the sample while well hydrated and preferably in the morning, but otherwise, there are no special instructions, such as fasting, for this test.

Venepuncture appointment - how to prepare

If you are coming into one of our clinics for the test, this is what you need to do before you arrive:

  • Drink plenty of water about an hour before the appointment.
  • Avoid coffee/tea/energy drinks. Water is good!
  • That’s it! We’ll do the rest.

Home test kit for Full Blood Count (CBC) Test - how it works

Our blood test kits are simple and convenient.

The most important step in doing a blood test at home is to read the instructions very carefully. The process is very simple, but there are a few pitfalls you need to be aware of - you will save yourself a lot of time if you do it right the first time around!

  • Full printed instructions will arrive with your kit - please read them carefully.
  • Drink plenty before taking the sample and warm your hands up in the sink with warm water for a few minutes. This will make your blood flow much better.
  • Fill the tubes to the top line. We don’t need much blood; filling tubes to the top line is about 15 drops of blood.
  • Post the samples on the same day you take them, before midday, Monday to Thursday. If you post it any other time it might get to us late or be stuck at a sorting office over the weekend. You will then have to do it again.
  • Package the sample in the same box the kit came in. Otherwise, Royal Mail or DPD will reject it. The sample tubes go into a pouch, then into a cardboard box, and then into a return envelope. All of this is provided in the kit: please use it.

We look forward to receiving your sample in our lab!

How the finger prick home test kit for Full Blood Count (CBC) Test works - from Dr. Adam Staten

Why choose us?

Hello! My name is Dr. Vinesh Mistry, I am part of the GP team here at One Day Tests and here is why you should trust us to test your blood.

We run our own regulated laboratories and our own accredited clinics. We manufacture our own approved home sample collection kits. Your results are looked after by our fantastic clinical governance team and our super-talented biomedical science team.

When you book your test with us - you book directly with the lab. This means accuracy and responsible duty of care, direct access to the provider and extremely fast turnaround times.

Finally, our customer services rock! You can ask the lab a question any time or you can speak to a real human. It's good to WhatsApp, email on or give us a call on 0845 527 07 67.

Frequently Asked Questions

Hi, I am Lana Nela, Lead Nurse, and here is what we are frequently asked about this test.

What Does the Full Blood Count Measure? 

The full blood count looks at quite a large number of different parameters. It looks at the number of red blood cells you produce which tells us whether you are anaemic and whether you may be losing blood from somewhere. It tells us the number of white blood cells you are producing, and the proportions of the different white blood cells that you have which can give us vital clues about the overall health of your immune system and whether you might be suffering from an infection. And it also counts the number of platelets you produce and so tells us that your blood clotting is healthy. Beyond these counts, we also learn more detailed information about the red blood cells may indicate whether your iron, B12 and folate levels are healthy.

What does an abnormal Full Blood Count Mean? 

Because it is a complex test, the full blood count needs to be interpreted in the context of any symptoms you may have. An abnormal full blood count may result from something simple like a viral infection or a lack of iron in your diet, but other abnormalities may represent more sinister underlying diseases such as leukaemia. 

Why take this test?

Hi, I am Dr. Marco Esposito and here is why it's important to take this test.
  • To check that you are not anaemic
  • To check on the health of your immune system
  • To check if your blood clots properly
  • To gain an indication about various micronutrient deficiencies such as iron, B12 and folate

Is this test right for you?

Hi, I am Jehad Al-Nashash, I am the Laboratory Director. Here are the symptoms that you may wish to address with this test.

The full blood count gives you a tremendous amount of information about your general state of health.

The results can be interpreted to tell you about the functioning of your immune system, your nutritional status, and the presence of infections or serious underlying diseases. This is the starting point in any diagnostics, so if you are not sure what is happening - this is the test to get.


    Blood in stool, Blood in urine, Chronic fatigue, Confusion, Easy bruising, Fainting, Fatigue, Feeling sick, Fever, Frequent infections, Hair loss, Headache, High blood pressure, Immune system, Inflammation, Insomnia/lack of sleep, Itchy skin, Thirsty all the time, Tiredness, and Weakness

Why blood tests are important.